#include<stdio.h>
int n, m, sum=0;
int main()
{
	scanf("%d", &n);
	for(int i=1; i<=n; i++)
	{
		scanf("%d", &m);
		sum += m;
	}
	double average = sum*1.0/n;
	printf("%.1lf", average);
	return 0;
}
